Since it is paywalled I can only guess from the title.

I don't understand the problem. He was payed for reading books and now we all have his voice. What did he expect?

Is there an AI imitating his voice making money? Is it being represented with his name? If not, what would be the difference with some person imitating his voice, whould that be stealing too?

Basically I don't see any problem with me buying those books training local model and give it other books to read. That can not be illegal, right?

Giving it to other people mentioning his name would definitely be fraud. But stealing? I don't know.

Selling it to other people under other name... I don't see a problem.

But than we come to AI generated images and I do start thinking in that way. Thou if they can find someone that looks like him, and other person sounding like him... they are all good?